In 1054, Lý Thánh Tông – the third Lý emperor – renamed the country Đại Việt. In 1149 the Lý dynasty opened Vân Đồn seaport in the modern north-eastern province of Quảng Ninh to foreign trade.[a]

The Dai Viet successfully stopped attacks by the Khmer Empire under Suryavarman II in 1128, 1132, and 1138. A final expedition in 1150 had to withdraw before it could attack.[3]

Dai Viet is a strategic location. By invading Dai Viet, the Mongols would be able to bypass the Himalaya and drive deep into South East Asia. However, the Mongolians of the Yuan Dynastyinvaded Dai Viet three times and were defeated. The last battle, the Battle of Bach Dang, was a decisive defeat for the Mongolians. Dai Viet's perseverance thrwarted Mongolian attempts to conquer South East Asia and prevented the fourth Mongolian invasion of Japan, as the Mongol navy was completely destroyed during Bach Dang. This became one the greatest victories in Vietnamese military history.

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Notes

^An embryonic independent Vietnamese administration was established and progressively renewed which laid a solid foundation for the development of the Vietnamese Kingdom of Đại Việt (Great Việt) during the Lý (1010−1226), Trần (1226-1400), and the early stage of the Lê (1428-1788) Dynasties. In 1149, Javanese and Siamese merchants arrived eager to trade with Đại Việt. The Lý Dynasty opened Vân Đồn seaport in the modern north-eastern province of Quảng Ninh for foreign trade.[2]

^When Nguyễn Hải Thần and his Việt Cách, the Việt Quốc, the Đại Việt, and others arrived in Hà Nội with their small armed forces, the Việt Minh had already established their administrative system; it was not strong, but it had spread to most of the provinces.[4]